Observation 104534: Amanita bisporigera G.F. Atk.

When: 2012-08-09

Collection location: Bedford Hills, New York, USA [Click for map]

Who: Linas Kudzma (baravykas)

Specimen available

Fruiting under Oak (some Maple also present nearby). Initially I thought Amanita virosa, but spores are too small and caps are not pure white. Initially a pleasant strong sweet smell, but becoming overpowering after a while. 5% KOH on cap gives yellow reaction and I can only find 2-spored basidia. See attached photomicrographs.

Spores globose to subglobose, amyloid in Melzer’s and (7.1-8.5) x (5.3-7.4) microns with an average Q of 1.15

Proposed Names

-14% (2)
Used references
Based on microscopic features
82% (1)
Recognized by sight: volval limb on bulb NOT upstanding and NOT somewhat distant from stem
Based on microscopic features: 2-spored basidia dominating in early mushroom season
Based on chemical features: yellow cap reaction

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Thanks Rod!
By: Linas Kudzma (baravykas)
2012-08-10 22:00:15 CEST (+0200)

Created: 2012-08-09 20:59:49 CEST (+0200)
Last modified: 2012-08-10 02:22:23 CEST (+0200)
Viewed: 160 times, last viewed: 2018-01-29 01:45:06 CET (+0100)
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